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Volumn 121, Issue 8, 1999, Pages 1645-1650

Ruthenium- and enzyme-catalyzed dynamic kinetic resolution of secondary alcohols

Author keywords

[No Author keywords available]

Indexed keywords

ACETIC ACID; ALCOHOL; RUTHENIUM;

EID: 0033518869     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja983819+     Document Type: Article
Times cited : (388)

References (111)
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    • note
    • Using 1 equiv of benzophenone gave a high initial formation of acetophenone which dropped during the course of the reaction, indicating that benzophenone indeed worked as a hydrogen mediator. After 24 h, the product composition was acetate/acetophenone 87:13, and that without added ketone was 85:15. Adding hydrogen gas (5 mL) and closing the system had no effect.
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    • note
    • For other solvent studies using Novozym 435, see refs 17a, 18f, and 18i.
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    • This electronic effect has been seen by others in ruthenium-catalyzed asymmetric transfer hydrogenation reactions: (a) Hashiguchi, S.; Fujii, A.; Takehara, J.; Ikariya, T.; Noyori, R. J. Am. Chem. Soc. 1995, 117, 7562. (b) Jiang, Y.; Jiang, Q.; Zhu, G.; Zhang, X. Tetrahedron Lett. 1997, 38, 215.
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    • This electronic effect has been seen by others in ruthenium-catalyzed asymmetric transfer hydrogenation reactions: (a) Hashiguchi, S.; Fujii, A.; Takehara, J.; Ikariya, T.; Noyori, R. J. Am. Chem. Soc. 1995, 117, 7562. (b) Jiang, Y.; Jiang, Q.; Zhu, G.; Zhang, X. Tetrahedron Lett. 1997, 38, 215.
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    • note
    • A big difference in rate between 1-naphthylethanol (14) and 2-naphthylethanol (16) has been observed in ruthenium-catalyzed asymmetric transfer hydrogenation reactions. See ref 26a.
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    • note
    • Substrates with larger groups (e.g., isopropyl) next to the alcohol function are too sterically demanding for this particular enzyme; see ref 18e.
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    • Closely related substrates gave low E values when using Candida antarctica in hydrolysis of the corresponding butanoic esters; see ref 19b.
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    • The separation of 1-phenylethyl acetate (4) and 4-chlorophenyl acetate is difficult, and in most cases only unreacted 1-phenylethanol (3) was separated in this purification. The hydrolysis was performed on the mixture of (R)-1-phenylethyl acetate and 4-chlorophenyl acetate, and the (R)-1-phenylethanol was isolated in the purification after the hydrolysis step.
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